Is the monorail worth it?

If it's your first trip, do not do the monorail. 

The Deuce bus is much more highly used, more convenient, provides more time than the monorail (deuce is 24/7 and monorail closes at 2a/3a depending on the day), stops at several more places than the monorail, has an express option, covers the entire strip and the outlets, allows you to "see" Vegas from the top of the double-decker (which is in itself an experience), and it also allows you to go downtown, off-strip and other places in vegas. $20 covers 3 days on the Deuce. 

The monorail is only on one side of the strip, only at a few hotels, only on the strip (not anywhere else in vegas), always at the back of these properties (requiring so much walking that it negates the value since you could have just walked to the other casino in the same time as finding the monorail), low in value and takes away from the "sight-seeing" aspect of Vegas because it's facing the back of the properties. $20 covers 2 days on the monorail (and remember these are not 24-hour days).

Besides walking is part of the fun of Vegas. Walking immerses you into the vibe of Vegas. And if you are mid-strip, chances are you will rarely need a taxi unless you are in a rush! Even if you take a taxi, there is still lots of walking inside these humongous resorts. Bring comfortable shoes!


Edit: At MGM Signature, the value of the monorail is valid! It already requires so much walking getting out of there so it's worth it. Beautiful property. The monorail will help with ease of movement from Signature. Another place that the monorail is valid is LVH. In fact, the monorail makes LVH valuable. Situated just off the strip on the north end, LVH is in a neglected spot. The monorail from LVH helps you quickly get to center strip with ease. You never have to feel like you are off-strip. You are always "connected"!